We stayed at Thawatchai's place for 4 nights. We are family of 4 with small children. I found it was more affordable to stay at Airbnb than putting your money to the 5 stars hotel that you wouldn't spend much time inside anyway.
I would give Thawatchai 10 stars for being so accommodating. My flight landed around midnight and my 2 kids were ready to explode. I asked Thawatchai ahead of time if I could pick up the keys somewhere else instead of walking to his office and come back. He responded to my request promptly and suggested that he could park his bike in the parking lot and left the key box there.
The location is very convenient. Though, it is a bit far from the center of Bangkok. The BTS (Skytrain) is only a few steps away. There are tons of local good street foods on Soi Udomsuk, which is across the street from the condo.
I would recommend Thawatchai's place to anyone who is looking to spend their time in Bangkok, Thailand.